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Posted to dev@marmotta.apache.org by "Sebastian Schaffert (JIRA)" <ji...@apache.org> on 2014/09/16 11:20:34 UTC

[jira] [Resolved] (MARMOTTA-367) KiWi SPARQL: support for OPTIONAL

     [ https://issues.apache.org/jira/browse/MARMOTTA-367?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Sebastian Schaffert resolved MARMOTTA-367.
------------------------------------------
       Resolution: Fixed
    Fix Version/s: 3.3.0

> KiWi SPARQL: support for OPTIONAL
> ---------------------------------
>
>                 Key: MARMOTTA-367
>                 URL: https://issues.apache.org/jira/browse/MARMOTTA-367
>             Project: Marmotta
>          Issue Type: Sub-task
>          Components: KiWi Triple Store
>    Affects Versions: 3.1-incubating
>            Reporter: Sebastian Schaffert
>            Assignee: Sebastian Schaffert
>             Fix For: 3.3.0
>
>
> The OPTIONAL construct is very popular among SPARQL users, but currently not directly supported by the KiWi SPARQL optimizations. We should investigate how OPTIONAL can properly be translated into a SQL LEFT OUTER JOIN to improve the performance of such queries.



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